LP3923TL/NOPB

TI Store Price:

LP3923TL/NOPB-Cellular Phone Power Management IC (PMIC)

The LP3923 is a fully Integrated Power Management Unit (PMU) designed for CDMA cellular
phones.

The LP3923 PMU contains a fully integrated Li-Ion battery charger with power FET and
over-voltage-protection (OVP), one Buck regulator, 8 low-noise low-dropout (LDO) voltage
regulators, and a high-speed serial interface to program on/off conditions and output voltages of
individual regulators, and to read status information of the PMU. Two LILO (low-input, low-output)
type LDOs with separate power input provide an application option for pre-regulated high efficient
power management for longer battery life.

The Li-Ion charger can safely charge and maintain a single cell Li-Ion battery operating
from an AC adapter. The charger integrates a power FET, a reverse current blocking diode, a sense
resistor with current monitor output, and requires only a few external components. Charging is
thermally regulated to obtain the most efficient charging rate for a given ambient
temperature.

A built-in Over-Voltage Protection (OVP) circuit at the charger inputs protects the PMU
from input voltages up to +28V, eliminating the need for any external protection circuitry.